Presentation Information
[25p-22C-9]Evaluation of factors for voltage loss in all perovskite tandem solar cells
〇(PC)Gaurav Kapil1,2, Yasuhiro Fujiwara1, Qing Shen1, Hiroshi Segawa2, Shuzi Hayase1 (1.Uni. of Electr.Comm., 2.Uni. of Tokyo)
Keywords:
All perovskite tandem solar cells,Wide bandgap solar cells,Narrow bandgap solar cells
All perovskite tandem solar cells (APTSC) are now getting great attention from the solar cell community because of the rapid growth in power conversion efficiency (PCE) to >27% [1] since its first demonstration of <5% [2]. The tandem structure consists of two main parts, the narrow bandgap cell, and the wide bandgap cell, ideal bandgaps of 1.2-1.3 eV and 1.7-1.8 eV respectively are necessary for achieving the highest possible PCEs. The rapid advancement in the PCE of APTSCs is credited to the efforts of scientists working on improving the PCE of narrow bandgap tin-lead perovskite solar cells (TLPSCs) despite the presence of unstable tin components. The open circuit voltage (Voc) loss has been reduced significantly and is now approaching the Schockley-Queisser (SQ) limit [3]. Therefore, at present, the research demands improvement in the performance of wide bandgap solar cells, especially from the viewpoint of a decrease in Voc loss. In this work, we concluded that high voltage loss in wide-bandgap solar cells is the bottleneck in further improvement of tandem solar cells that needs to be overcome. Apart from this, halide segregation is one of the key issues that need to be solved. Therefore, in our work, we highlighted these drawbacks and the strategies to overcome the issues.